It strikes me as a lot of the armor use skills seem to fit the more "higher strength" sorts (more with metal/stone, maybe bone), while the aim/precise aim/opportunity strike tree is being given to more "dexy" classes. Though if I wanted to think about it, there might be a certain intelligence/wisdom factor in thinking how to use it. (I could see an elf being smarter with his mithril than a giant with massive platemail....or it could all be done %based)

So, long story short...any stat factors we might want to consider for armor use or exploitation?